512 



THE NERVOUS SYSTEM. 



of Sylvius. It is on the left side in persons that are right- 

 handed, and on the right side in those that are left-handed. 



Sensory Areas. When a sensory area is stimulated, the move- 

 ment which results is reflex. Thus, if the auditory area, which 

 was localized, perhaps incorrectly, by Ferrier in the superior 

 temporosphenoidal convolution, is stimulated, the animal pricks 

 up its ears and turns its head to the opposite side. If a sensory 



FIG. 303. Base of brain : 1, 2, 3, cerebrum ; 4 and 5. longitudinal fissure ; 6, 

 fissure of Sylvius ; 7, anterior perforated spaces ; 8, infundibulum ; 9, corpora albi- 

 caiitia ; 10, posterior perforated space ; 11, crura cerebri ; 12, pons Varolii ; 13, junc- 

 tion of spinal cord and medulla oblongata ; 14, anterior pyramid ; 14 X , decussation 

 of anterior pyramid ; 15, olivary body ; 16, restiform body ; 17, cerebellum ; 19, 

 crura cerebelli ; 21, olfactory sulcus ; 22, olfactory tract ; 23, olfactory bulbs ; 24, 

 optic commissure ; 25, motor oculi nerve ; 26, patheticus nerve ; 27, trigeminus 

 nerve ; 28, abducens nerve ; 29, facial nerve ; 30, auditory nerve ; 31, glossopharyn- 

 geal nerve; 32, pneumogastric nerve; 33, spinal accessory nerve; 34, hypoglossal 

 nerve. 



area is extirpated, there is a loss of the sense presided over by 

 this area. 



Visual Area. This is located in the occipital lobe and the 

 angular gyrus. 



Auditory Area. Ferrier located this in the superior temporo- 

 sphenoidal convolution. 



The location of other areas is a matter of considerable doubt. 



